I ran into too many bugs with Unity and the performance was horrible, so I switched over to Gnome Shell and had the same performance I had with Gnome 2, and it's a lot more usable. Also, it's prettier, and the integrated notifications system is great (for example, they've embedded the Empathy chat right into so you just hover to bottom right click on the icon and it brings up this little integrated chat box (the only problem I have is to use it without having to have the empathy chat window open is to have someone else initiate the conversation, and it'd be great if they integrated the contact list)).
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